package map;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class MapDemo22 {
    public static void main(String[] args) {
        Map<String,Integer> map=new HashMap<>();
        map.put("语文",99);
        map.put("数学",98);
        map.put("英语",97);
        map.put("物理",96);
        map.put("化学",95);
        System.out.println(map);

        //遍历所有key
        Set<String> keySet= map.keySet();
        for (String key : keySet) {
            System.out.println("key:"+key);
        }

        Set<Map.Entry<String,Integer>> entrySet=map.entrySet();
        for (Map.Entry<String,Integer> e:entrySet) {
            String key=e.getKey();
            Integer value=e.getValue();
            System.out.println(key+":"+value);

        }

        Collection<Integer> values=map.values();
        for (Integer value :
                values) {
            System.out.println("value:"+value);
        }


    }
}
